who knows how to get it
just tell me ok?

thank you!

it depends on the rookie digimon...

And here is how you get all the mega levels:
http://www.gamefaqs.com/console/ps2/file/580782/37679

And if you don't even say which Imperialdramon you are looking for you're just giving other people more work.
Though, I doubt you will be able to unlock either of the Imperialdramons. You should be at the very least level 113 to try that.

thanks dude

now i know how to get alphamon and imperialdramon
i just read the blog
to get alphamon is to :

Hint: Alphamon:
If you selected Agumon in the beginning, you can get him by going on the Booster Pack Collection sidequest set by the Digi-Elfs in the Terminal Area and clearing the dungeon with only 1 HP, without recovering your HP or using a Gate Disk. This must be done in Hard Mode. If you chose Veemon or Dorumon in the beginning, go on the "Treasure Hunt" sidequest set by the Digi-Elfs in the Central Area. Clear the dungeon, and bring back the Sword Cannon Delta. This must be done in Hard Mode. If you chose Guilmon in the beginning, clear Item Road after completing the game in Hard Mode.